Head-rest for dental chairs



(No Model.) 7

- A. R. MERRIOK.

HEAD BEST FOR DENTAL CHAIRS. 4 No. 333,019. Patented Dec. 22, 1885.

UNITED STATES PATENT Orrrcn.

- ALVA R. MERRIOK, OF BLOSSBURG, PENNSYLVANIA.

vHEAD-REST FOR DENTAL CHAIRS.

SPECIFICATION forming part of Letters Patent No. 333.019, dated December 22, 1885.

Application filed March 9, 1885. Serial No. 158,198. (No model.)

To all whom it may concern: I

Be it known that I, ALVA R. MERRIOK, of Blossburg, in the county of Tioga and State of Pennsylvania, have invented a new and useful Improvement in Head-Rests in Dental Chairs; and I do hereby declare that the following is a full, clear, and exact description of the same.

My invention relates to head-rests for dental and other chars, having for its object to make provision for the adjustment of the immediate headsupportin all directions on its standard, and for its adjustment and extension with its standard in any direction, either laterally or forward and backward or up and down, or at any desired angle-for the purpose, generally stated, of bringing the rest in any position required for the occupant of the chair.

In the accompanying drawings, Figure 1 represents a side elevation of the complete head-rest and its supporting-standard. Fig. 2 shows the head-rest and supporting-standard with parts of the clamps removed. Fig. 3 shows in perspective the rest in laterally-extended position. Fig. 4 shows section of the clamp.

In these drawings, A represents an ordinary standard adjustable vertically and by rotation in an ordinary clamp, B, adapted to be attached to a chair, and which,with the standard A, may be changed for any other suitable means for supporting the rest and its adjustable standard and joints to the chair. The top of the standard A is perforated and flattened, as shown at a, and preferably also has a shoulder, b. To this is attached a clamp, C, composed of two parts, d (I, both having a hole corresponding to that in the top of the standard, and adapted to receive the clamping-bolt e. The parts d d of the clamp C have nearly circular portions 1,which fit to the sides of the flattened top of the standard A, allowing the clamp to swing through a semicircle on the bolt c. On these parts (1 d are extensions 2 2, in which are grooves forming, when the parts are brought together, a hole to receive the standard D, to which the rest F is attached. The standard D is round, and fitted to the hole in the extensions 2 2, so that it may slide or turn therein. The parts are so adjusted that by turning the nut on the pivoting-bolt both theflattened head of the standard A and the round part of the standard D are clamped at the same time. Thus any desired elevation in the limits of its length may be secured, and also any desired angle, as illustrated in Fig. l in full and dotted lines. By this construction the rest may be extended above or into the chair to suit either a tall person or a child, and it may also be tipped to any desired angle in relation to the chair-back. The top of the standardD is also flattened, as shown at a, and has a shoulder, 1). To it is attached a clamp, G, exactly of the same form as the clamp C, and held to the standard by a bolt in the same manner as above described. The extensions 4 4 of this clamp have grooves fitted to receive and hold the shank f, iixed to the plate of the head-rest proper, F. On this shank the head-rest F may rock laterally; but it is clamped by the tightening-nut 5, which at the same time causes the clamp to grip the flattened top of the standard D. On the bolt, therefore, of this standard and clamp the rest F may turn to adjust theinclination thereof to front or rear, while the rest is adjusted laterally on the shank f .or turned on the joint-standard D, which turns in its clamp 0. By turning the standard A the standard D may be made to face to the right or left, and then the. latter may be brought down to a horizontal position or to any angle desired, and by slipping the stand ard D in its clamp the head-rest may be extended to the side, as it is illustrated in Fig. 3. When brought to this position, the rest is still capable of adjustment in all directions. It will thus appear that the rest F is connected to its support A or to any similar or suitable support by two clamp-joints (which allow universal adjustment of the rest) combined with a slip-joint. The pivots of the upper clampjoint are the shankfand the bolt of the clamp,

whereby vertical and lateral adjustment of the rest is permitted. The lower clamp-joint has for its pivots the clamp-bolt and the turning standard A. The slip-joint is formed by the standard D and its clamp-socket, which also allows the standard D to turn.

As before intimated, the standard A may be vertically adjustable or not; but I prefer to make it thus adjustable.

I do not limit myself in respect to the form too of the rest F, nor as to the precise form of the clamps, as they may be modified to allow the universal movement and the clamping; but the form shown of the joints and clamps is 5 preferred.

The nuts may be adapted to a wrench, as shown, or be made as ordinary thumb-nuts.

Iam aware that it is not new to employ balland-socket joints and various other devices for 10 the purpose of permitting the necessary, ad-

justment of the head-rest; and Iam also aware that a verticallyadjlistable supporting-standard for the rest is also old, and Ido not claim, broadly, these ideas.

I claim as my invention- In combination with the head-rest having a shank, f, a clamp, 0, having the two parts 

